This patch adds the setmaskedbits_xxx() macros, which are used to set a multiple-bit bit pattern in a register. The macros include a mask, which zeros the respective bits before applying the value via a bitwise-OR. There are big-endian and little-endian versions for 8, 16, 32, and 64 bits.
These new macros are useful because the setbits macros can only be used to set single-bit fields. For example, if you have a 32-bit register where bits 17-20 need to be set to 0100, you would do setmaskedbits_be32(p, 4 << 11, 0xF << 11). Signed-off-by: Timur Tabi <[EMAIL PROTECTED]> --- Updated the changelog to include a reason why you'd want these macros. I have a number of new SOC device drivers coming up that will use these macros, if this patch is accepted. include/asm-powerpc/io.h | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-) diff --git a/include/asm-powerpc/io.h b/include/asm-powerpc/io.h index bb8d965..ac3defb 100644 --- a/include/asm-powerpc/io.h +++ b/include/asm-powerpc/io.h @@ -734,6 +734,19 @@ static inline void * bus_to_virt(unsigned long address) #define setbits16(_addr, _v) out_be16((_addr), in_be16(_addr) | (_v)) #define clrbits16(_addr, _v) out_be16((_addr), in_be16(_addr) & ~(_v)) +#ifdef __powerpc64__ +#define setmaskedbits_be64(a, v, m) out_be64((a), (in_be64(a) & ~(m)) | (v)) +#define setmaskedbits_le64(a, v, m) out_le64((a), (in_le64(a) & ~(m)) | (v)) +#endif + +#define setmaskedbits_be32(a, v, m) out_be32((a), (in_be32(a) & ~(m)) | (v)) +#define setmaskedbits_be16(a, v, m) out_be16((a), (in_be16(a) & ~(m)) | (v)) + +#define setmaskedbits_le32(a, v, m) out_le32((a), (in_le32(a) & ~(m)) | (v)) +#define setmaskedbits_le16(a, v, m) out_le16((a), (in_le16(a) & ~(m)) | (v)) + +#define setmaskedbits_8(a, v, m) out_8((a), (in_8(a) & ~(m)) | (v)) + #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_IO_H */ -- 1.5.2.4 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
